So...is the term "extended arm bar" unclear?

[MechanicGuy]

I didn't think so. For over a year now, I though I knew what this meant, particularly as it applies to 10-6-12.

I've been taught at clinics and camps, and seen on NFHS slides at the master clinic, that this meant the defender placing their forearm on the offensive player...away from their own body.

Tonight, at out biweekly area meeting, the topic du jour was 10-6-12. The official presenting, or leading the discussion, is insisting that "extended" means the arm istelf is extended....as in at the elbow, into nearly a straight arm. He is explaining this as it relates to post play, and explicitly says that arm bars (as in forearm in the back of the offensive player, with the ball) are normal and legal.

I was stunned. This is a very good official, someone who also works college ball. I injected my thoughts, and the room was somehow split on the issue.

Am I nuts? Isn't the term extended arm bar plenty clear? As anyone else run into these issues within your area? Working with officials from other areas?